Everything has a degree, but beyond this degree, the effect is not very good. Drinking too much green tea will cheer up the nerves and affect sleep. Drinking too much tea a day with high concentration will cause calcium loss in bones. Tips for drinking green tea: Since Shennong (Yandi) discovered tea, tea has been spread for thousands of years with its unique quality and health care effect, and is deeply loved by people. Tea culture in China is developing more and more. Modern scientific research has proved that the health functions of green tea mainly include anti-cancer, quenching thirst, promoting fluid production, diuresis and detoxification, reducing blood fat and weight, invigorating heart and refreshing, enhancing immunity, lowering blood pressure, preventing cardiovascular diseases, helping digestion, clearing liver and improving eyesight, etc. In order to ensure the freshness and tenderness of green tea, make it taste better, and at the same time make the nutrients in green tea better absorbed by human body, it is more appropriate to brew it with water at about 80℃. When making tea, first scald the cup or pot with hot water, commonly known as "warm cup", then put the green tea into the cup or pot, and press 1 g green tea to make 50? Rinse with 60 ml of water and let stand for about 3 minutes to enjoy the color and taste. Generally speaking, as far as the nutritional components and medicinal effects of tea are concerned, the first tea is fresh and refreshing, the second tea is strong but not fresh, the third tea is bland and tasteless, and the fourth tea lacks flavor and has little drinking value after soaking. Tea consumption depends on drinking habits, age, health status, living environment, customs and other factors. Healthy adults who usually have the habit of drinking tea usually drink about12g of tea every day, divided into three times? It is more appropriate to brew for 4 times. For people who have a lot of physical labor, consumption and food intake, especially those who are exposed to toxic substances in high temperature environment, it is more appropriate to drink 20 grams of tea every day. People who eat more greasy food and have a large amount of tobacco and alcohol can also increase the consumption of tea appropriately. Pregnant women and children drinking tea, neurasthenia and tachycardia should be reduced appropriately. Special reminder: it is not advisable to drink tea before going to bed and after taking medicine. In addition, patients with constipation, insomnia, anemia, calcium deficiency or fracture, gastric ulcer, gout, urinary calculi, cold and fever should not drink tea.